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Besides the SC Duplex, you may occasionally see the FDDI bifold connectors which acquaintance to their specific networks. They are about used to affix to the accessories from a bank outlet, but the blow of the adjustment will accept ST or SC connectors. Aback they both use 2.5 mm ferrules, they can be akin to SC or ST connectors with adapters.
The NEC D4 was allegedly the aboriginal adapter to use bowl Fiber Distribution Terminal or amalgam ceramic/stainless animate ferrules. It uses a abate ferrule than SCs or FCs. It was broadly used in telco networks in the 80s to aboriginal 90s and some may still be in use.